I'd say the answer is B, to provide the details and arguments that support the main idea.
Ralph says there are no monsters on the island. ... Jack torments Piggy and runs away, and many of the other boys run after him. ... In this chapter, the fear of the beast finally explodes, ruining Ralph's attempt to restore
Practice reading in your head at home every day for 20 mins.
She uses pronouns i and me. instead of the name. you can tell also by the train of thought that is conveyed.